What type diode for battery reversal protection?

From: royalmp2001 (royalmp2001_at_hotpop.com)
Date: 02/26/05 

Date: 26 Feb 2005 10:01:53 -0800

Do I need a signal diode (like IN4148) or a rectifier diode (like
IN4001) to add to the +ve line to protect against polarity reversal?
Would the available supply after the diode be 0.6V less? Is there any
way of avoiding this?
Thanks, everyone

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